Although, the date of the Cup game has still not been confirmed, it would take place on either 22nd or 23rd of September. According to the official Chelsea website:

“Six of the 11 meetings between these two clubs have been in this competition – comprising three two-legged ties which were all won by Chelsea, the most recent in 1992 when Robert Fleck, Dennis Wise, Eddie Newton and Andy Townsend scored in 4-0 aggregate victory.

Former Chelsea FA Youth Cup winner Milan Lalkovic is in the current Walsall squad. They are second in their division after four games.”